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Date: Wed, 21 Feb 2024 10:56:40 -0800
From: Jakub Kicinski <kuba@kernel.org>
To: Eric Dumazet <edumazet@google.com>
Cc: Jiri Pirko <jiri@resnulli.us>, "David S . Miller" <davem@davemloft.net>,
 Paolo Abeni <pabeni@redhat.com>, netdev@vger.kernel.org,
 eric.dumazet@gmail.com
Subject: Re: [PATCH net-next 12/13] rtnetlink: make rtnl_fill_link_ifmap()
 RCU ready
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On Wed, 21 Feb 2024 18:15:11 +0100 Eric Dumazet wrote:
> > This check(optimization) is unrelated to the rest of the patch, correct?
> > If yes, could it be a separate patch?  
> 
> Sure thing. BTW, do you know which tool is using this ?
> 
> I could not find IFLA_MAP being used in iproute2 or ethtool.

FWIW I think it's just a blind forward-port of the ioctl functionality.
Would be really great to find a way to phase those fields out of struct 
net_device if not the uAPI :(